Opening device for tins and sheet-metal boxes.



H. BERGGRAF.

OPENING DEVICE FOR TINS AND SHEET METAL BOXES. APPLICATION FILED JUNE 1. 19m.

1,210,139, Patented Dec. 26,1916.

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YIIIIIII/l 'IIlIl/I/IA Inventor:

Hans E El" ggr 11f tion.

nnirnn STA-Tins rarnn'rorrim nnnsnnneennn, or STAVANGEB. nonwnm.

OPENING DEVICE Fon'rINs Ann seiner-METAL BOXES.

eionee.

To all whom it may concern: I

Be it, known that'I, I-IANsBERGGRAF, engineer, citizen of Norway, residing at Eilert Sundts Gate 22, Stavanger, Norway, have invented new and useful Improvements in OpeningDevices for Tins and Sheet-Metal Boxes, of which the following is a specifica- The present invention has for its object to provide an opening device for tins, cans and sheet metal boxes. f

According to this invention the opening tongue, its substitute or the part holding it fast and which is gripped and coiled up by the key, is formed from the material of the can cover, so that theiuse of solder is not necessary and the tongue need not be folded into the folding seam connecting together the can body and cover.

The invention is illustrated in the accompanying drawing, in which Figure l is a longitudinal section of a can or box cover showing the first stage of the formationof thetongue or of the part holding it fast. Figs. 25 show'different forms of execution. Figs. 68 show another form, Fig. 6 being a longitudinal section of the can cover in the first stage of the formation of the tongue, Fig. 7 being a section through the finished cover, the opening key being placed in position, and Fig. 8 being a section of. the opening tongue or rip drawn to a larger scale.

The cover -1, which has been pressed in the die in usual manner, has for the most part the ordinary shape comprising middle portion 2, side portions 3' and folding rim 4- as shown inFig. 1, but the cover differs from the ordinary shape in that the middle portion -2 is provided with a member -5 near one edge,this member being also pressed up in the die. The cover is then laid into a special machine, in which the bulb -5 has opposite walls folded against each other. During this operation the bulb may be compressed in such a manner that it holds fast the doubled inner portion 1lof the ordinary loose, opening tongue 10. The member 5 may also itself constitute the Specification of Letters Patent. P tented Dec. 26, 1916. Application filedJune i, 1916. Serial No. 101,046.

bled portion may be bent toone'side 14 v in Fig. 4) or as "shown at 15 in Fig. 5.

According to the Figs. 6-8 the member 5- is compressed'so as to form anrupwardly projecting rib or railof about T- shaped cross section. Whenakey7 hav-.

ing the cross'section shown in Fig. 7 is ap plied over the top of the rib *"6 and is then turned, the sheet metal cracks at 8 or 9 (Fig. 8),' whereafter the opening is continued along weakened lines in ordiin order to cause the rib nary manner.

.6 to be easily separated just at the desired place 8' or -9- from the remain in material a weakenin is madeb ress-.

ing at this place as indicated in Fig. 8. This weakening may be made simultaneously with the formation of the rib .6-.

Having now described my invention,what

, I claim as new and desire to secure by Letters Patent is: r

1. In a, sheet metal. receptacle having a wall provided with a weakened,tearing por-.

tion integral therewith, an outwardly pro- Jecting gripping member integral with said tearing portion and, including sidewalls folded against each other. i p

2. Tnasheet metal receptacle having a wall provided with a weakened, tearing por-,

tion integral therewith, a projecting, gripping member formed integral with the said I name to this specification in the presence of two subscribing witnesses. I

r I HANSBERGGRAF.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

tearing portion and having in itself a weakened part connecting itwith thejstrong part 

